Tuning apparatus

Details Tuning apparatus Tuning apparatus

1978-06-15

1980-04-15

Heyman, John S.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 79R, 324 81, 84454, H03K 906, G10G 702

Patent

active

041986067

ABSTRACT:
A fundamental frequency detection device generates a fundamental frequency pulse signal having a frequency corresponding to the fundamental frequency of a signal to be tuned. The fundamental frequency pulse signal is converted to a first pulse signal having a pulse width corresponding to the fundamental frequency. The pulse width of this first pulse signal is compared with that of a second pulse signal of such a pulse width as to correspond to the frequency of a reference sound signal. A deviation signal expressing the frequency deviation between the signal to be tuned and the reference sound signal is obtained by counting cent value-corresponding pulses during the period corresponding to the difference of the pulse width between the first and second pulse signals.

REFERENCES:
patent: 3722353 (1973-03-01), Westhaver
patent: 3968719 (1976-07-01), Sanderson
patent: 4019419 (1977-04-01), Yoshikawa et al.

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